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An argument is sometimes made that statistics like GDP don’t capture the gains being made by consumers. A television set that used to cost thousands of dollars now costs hundreds of dollars. True. But in other areas, such as finance, education, and health, the opposite has occurred: Expenditures have increased without any obvious gain in outcomes. Much of the financial sector’s growth consists of zero-sum gambling games, with no benefit to the real economy, yet this shows up as a benefit in the GDP. A law degree costs four times what it cost three decades ago, but is not noticeably better, yet this shows as a gain in GDP. Massive high-tech expenditures in medicine (which count as benefits) often yield only modest, zero, or even negative gains in terms of quality or length of life. The net of all these pluses and minuses has yet to be calculated. At this point, there is no basis for assuming a priori that the overcalculations exceed the undercalculations.
---> In this paragraph, I don't understand, what "the overcalculations exceed the undercalculations. " means.